Artificial tooth.



E. T. GOLDBERG.

ARTIFICIAL TOO TH APPLICATION FILED sum-2o. 1911.

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p FTElU smarts arnnrr UFFIE ELIAS '1. GOLDBERG, BRIDGEPORT, CONNECTICUT.

ARTIFICIAL TOOTH.

Specification of Letters Patent.

Patented Dec. d, ffillf.

original application filed August 24, 1917, Serial No. 188,041. Divided and this application filed September 20, 1917. .Serial No. 1923M.

To all whom it may concern:

Be it known that I, ELIAS T. GOLDBERG, a citizen of the United States, residing at the city of Bridgeport, county of Fairfield, State of Connecticut, have invented certain new and useful Improvements in Artificial Teeth; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in artificial teeth, and it has for a principal object to provide a metal backing and replaceable porcelain facing which are securely fastened together by a novel interlocking connection at the lower or biting edge.

The invention further resides in the features of construction hereinafter specified and claimed, reference being had to the accompanying drawing wherein- Figure 1 is a fragmentary front elevation of a set of teeth in process of construction.

Fig. 2 is a rear elevation of the tooth facing.

Fig. 3 is a vertical section on line 3-3 of Fig. 1.

Fig. 4 is a horizontal section on line d-& of Fig. 1, and Fig. 5 a molar construction in. Section.

Similar numerals of reference denote like parts in the several figures of the drawing.

This application is a division of my copending application Serial Number 188,041, filed August 24, 1917.

Referring more in detail to the drawings the numeral 1 designates a reinforcement of gold or other metal which is applied to the metal backings 2 that are assembled edge to edge, when a set of teeth are being constructed, each backing having a stud or key 3 extending from the front face of the backing near the upper part thereof. The stud 3 is headed, having undercut side flanges a for insertion through the entrance gate 5 of an undercut groove or slot 6 in the back of the tooth facing 7, so that said head will engage beneath the overhanging and opposing wall flanges 8 that are formed by undercutting the sides or walls of the slot.

Each backing has a forwardly turned lip 9 on the lower edge, and the rear portion of the lower or biting edge of the tooth facing 7 is notched transversely to provide a transverse seat 10 for engagement by the lip 9. The porcelain facing thereby overhangs the lip and conceals the metal backing even to the biting edge without sacrificing the reinforcement afforded by the lip which latter partially forms and protects the biting edge.

The interlocking between the backing and facing is effected by a downward or outward movement of the facing relative to the backing, and the latter when the lip 9 is interlocked with the notch 10 reinforces the porcelain facing and also keeps it from turning or twisting so that the alinement of the porcelain tooth will be insured.

In constructing a set of teeth the metal backings are assembled edge to edge and the gold or other reinforcement 1 is then applied to the rear faces of the backings. The slots or grooves 6 are then filled with a cementitious binder a and the entrance gates 5 positioned over the headed studs of keys 3. The facings 7 are then slid or moved downwardly or outwardly over the faces of the metal backings thereby causing the notches 10 to interlock firmly with the lips 9. The cement is also efficiently applied on the contiguous or abut-ting faces of the backings and facings.

The biting edges may be ground to present a smooth finish, and the teeth are greatly reinforced by the metal backings, and should the porcelain facings become discolored or broken they may readily be replaced by new facings.

The porcelain facing is afiorded a strong reinforcement and is easily removed in a simple operation. The construction is eX- ceedingly simple and practical since the interlocking at the biting edges between the porcelain facings and the metal backings may be economically formed. It is also obvious that the teeth may be either made single or in sets and that the facings may be formed of material other than porcelain, the latter term being used broadly to include gold or other facings.

In Fig. 5 a molar tooth is depicted having a molar shaped facing 11 in the extension of which is formed a transverse notch or groove 12 to receive the edge of the metal backing 2, and in this instance the backing is simply first engaged with the notch 12 and then, after the opening 5 has been filled with cement, the backing is forced into position With the stud 3 embedded within the inignpwardly from said gate to receive the cement Within the groove 6. Stud whereby said backing and facing may 10 I claim be interlocked, the rear of the lower biting An artificial tooth, comprising a metal edge of said facing having a transverse seat 5 backing having a studnear its upper end td'ifeceive the lip.

and provided a lip extending from it; In testimony whereof I aflix my signature.

lower edge, and a porcelain facing having- I A V gate therein and an undercut groove lead- ELIAS T. GOLDBERG.

Gopies of Vthis-patent'ma'y be obtained for five cents each, by addressing the "Commissioner of Patents.

' Washington D. G. 

